Hot-air furnace



(No Model.) 2 sheets-sheen `1,

M. RUDERT. 4 HOT AIR PURNAGE.

Patented Aug. 14, 1894.

W""mwwwmNmwww (No Model.) Y 2 Shets-Sheet 2.

M. RUDERT.

HOT AIR PURNAGB.

No. 524,653. Patented Aug'. 14, 1894.

\^// 5555.. [/E a W AM/ W7 4 www# f6;

` UNITED STATES APATENT OFFICE.

MAX RUDERT, OF DUQUESNE, PENNSYLVANIA.

Hor-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 524,653, dated August 14, 1894.

,Y Application led April 12, 1894. Serial No. 507,334. (No model.)

To all whom it may concern..-

Be it known that I, MAX RUDERT, of Duquesne, in the countyof Allegheny and State of Pennsylvania, have invented certain new use the same, reference being had to the accom-1 panying drawings, which form a part of this specification.

My invention relates to improvements in hot air furnaces, and it consists in the construction and arrangement of parts which will be fully described hereinafter and particularly referred to in the claims.

The object of my invention is to construct a furnace of the construction hereinafter shown and described whereby the fire box and combustion chamber are entirely surrounded. by an air space through which the air passes.v before receiving its [inal heating, wherebythe top and sides and especially the top are kept so cool that they will not burn anything against them, and which construction serves to give the cold air an initial heating before subjected to final high degree of heat.

In the accompanying drawingsznFigure 1- is a vertical longitudinal sectional view of a` furnace which embodies the invention com-I Fig. 2 is a horizontal sectional view plete. taken on the dotted line 2-2 of Fig. l. Fig. 3 is a vertical sectional view taken on the dotted line 3--3 of Fig. l. Fig. 4 isa detached View of the cleaner.

Referring now to the drawings, A indicates a re box of any desired construction and B the combustion chamber directlyabovc the same. A top C is provided for this combustion chamber, arising from the center of which is a pipeor flue D through which the smoke and products of combustion pass to the outside of the building.

A series of tubes or lues G are placed horizontally within the combustion chamber,but have no communication therewith whatever, as will be more fully explained farther on. There may be any desired number of these tubes or flues in each horizontal series, and the llues or tubes of any desired size according to the size and desired capacity of the apparatus. The tubes of each horizontal series however are placed directly above the tubes in the series below, because I find that the upper series are more uniformly heated than is the case where the tubes are placed staggering. It will thus be seen that theA heat and flames from the fire pot pass around and through these tubes heating them to a very high degree. Placed around this tire box and combustion chamber is an outer wall or casing, forming a space between the iire box, the walls b, of the combustion chamber, and between the top ofthe casing and the combustion chamber, this space being divided into several passages or chambers as will be fully described presently.

Referring now to Fig. 2 in particular, P is a horizontal division plate which extends around one side of and also the back: of the outer casing and between it and the top of the fire box, and about at the top of the fire box as shown in Figs. l and 3. This forms an L-shaped inlet chamber N for theinliowing air to be heated which air passes into the chamber through an opening t, either at the side or front of the fire box, into the vertical chamber Q, up this chamber into the hori- 1 zontal chamber F at the top of the combustion chamber, over the combustion chamber, down into the vertical chamber R, as indicated by arrows. This chamber R is f L- shaped in horizontal section as shown in Fig. 2, and one end of the hot air tubes G communicate with the said chamber, and the other ends of said tubes with the chamber e, an the front of the furnace. The air after receiving an initial heating by passing aroundthe re box and combustion chamber, over the latter and around to the rear side thereof, passes through the tubes and is highly heated, passing immediately into the outlet chamber e, and through the distributing pipes h, for conveying it to the different parts of the building. The air in passing around the combustion chamber keeps the top and sides of the outer casing d, too cool to cause combustion of anything touching it, and concentrates the heat within the combustion chamber for heating the hot air tubes G. I find that by this arrangement matches can be left upon the top of the casing d, and the hottest ire will not ignite them.

l with a series of transverse openings t, as

shown in Fig. 4, which receive the tubes. This plate is placed within the combustion chamber with the tubes Gr passing through the said openings as shown in Fig. l and Vis normally kept at the rear end of thefcombustion chamber as also shown in Fig.` 1. Ahaudle K is attached to this cleaner, and extends outside of the front of the furnace as shown, by means of which the said cleaner can be drawn outward at any desired time, thus cleaning all the soot and ashes from the tubes which fall into the fire pot.

A tube L extends from the Wall of thecombustion chamber to the outside of the wal-l f, of' the outlet air chamber e, through which they handle K passes, so that all possibility of the passage of smoke, or gases from the combustion chamber into the air chamber e is avoided.

A flame spreading plate I is placed over a 'portion of the tubes G, and the cleaner has a horizontal opening .I through which the said plate passes, and the pla-te I has an opening M at its front end so that the sootl and ashes drawn forward thereon fall through the opening downward into the fire pot.

While I here show the outer casing of metal, I do not limit myself to this, for it may be formed of brick, or other material, and the dimensions and shape orv contour of the furnace changed to suit any particular building, without departing from the spirit of ymy invention, so long as the internal arrangement remains the same. Y Y n I am aware that it isold to pass air around a ire box and through flues or tubes to be heated, and I make no claim to this, my invention relating to my particular construction whereby the air passes around the fire box, over the combustion chamber, and downward and then through the tubes, which ef fects a great saving of fuel and fire safe construction, as before specified.

U s, is a waterreceptaclefor moistenin g heated air. Y

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l.y A hot air furnace comprising a fire pot and combustion chamber above it provided with open ended lines, a casing surrounding said fire pot and combustion chamber, said casing forming a chamber N below the said tubes, a chamber Q at the side of the re pot in communication with said chamber N, but

`out of communication with the tubes, a chamberF above'the lire pot in communication :with the upper end of the chamber Q, a chamber R at the opposite side of the tire pot from chamber Q and extending around back of said repot, said chamber R being in communication with the chamber F and with one end of said fines, and an outlet chamber at the opposite end of said. flueswhrereb-y'the air ycirculates as described..

2. A furnace comprising a fire pct, a combastion chamber above'the same having horizontal open ended tubes, a lower L-shaped horizontal chamber around the re pot, an upper L-shaped horizontal chamber around the combustion chamba-na horizontal chamberl F above the combustienehaurberin communication with the upper Lshaped chamber, a vertical chamber in communication with the chamber F and out of communication with the fines, the upper L sha'ped chamber in communication. with one end of the Vfines, andan outlet chamber at the opposite end of and in communication with the fines, substantially as specified.

3. The combination. with a furnace having Vertical air fines, a combusti-on chamber havinghorizontal tubes communicating with said air iiues, a tube cleaner within the combustion chamber engaging said tubes, a rod or handle attached to the cleaner and extending to the outside of the furnace, and a tube extending through oneof the said vertical air fl'ues to the outside ofthe furnace and through which said rod passes for the purpose described.

In testimony whereof I a'ix my signature in presence of two witnesses.

MAX RUDERT.

Witnesses:

ALLEN S.` PATTIso-N, Guo. E. FREGH.

9.0V il 

